light streaks / bug?

[herbap]

light streaks under the window... is this bug or caustics?

[Ondra]

Is the material glossy? Try disabling glossiness/bump. I don't know where the light is coming from, but it is possible it is just some reflected light. I would need to see the scene to be sure

[herbap]

a sun and several corona lights...
with white material, no light streak, send the scene via http://corona-renderer.com/upload/

[Polymax]

Maybe it's "Crazy Bump" (bump >>>1)?

[Ondra]

ok, I went over the scene, and it seems like it is caused by a combination of factors:
- extreme bump value (44)
- extremely low bump filtering value (0.01)
- using reflection further increases bump strength
- using very skinny triangles causes self-intersections

I won't fix this now, but I'll save the critical part of the scene (the 2 offending polygons) for later, when I'll try to deal with selfintersections in more general way